This is a note to let you know that I've just added the patch titled
serial: omap: do not override settings for RS485 support
to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-next branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release during the merge window.
If you have any questions about this process, please let me know.
From 51f93776b84dee23e44a7be880736669a01cec2b Mon Sep 17 00:00:00 2001 From: Lino Sanfilippo l.sanfilippo@kunbus.com Date: Wed, 3 Jan 2024 07:18:17 +0100 Subject: serial: omap: do not override settings for RS485 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
The drivers RS485 support is deactivated if there is no RTS GPIO available. This is done by nullifying the ports rs485_supported struct. After that however the settings in serial_omap_rs485_supported are assigned to the same structure unconditionally, which results in an unintended reactivation of RS485 support.
Fix this by moving the assignment to the beginning of serial_omap_probe_rs485() and thus before uart_get_rs485_mode() gets called.
Also replace the assignment of rs485_config() to have the complete RS485 setup in one function.
Fixes: e2752ae3cfc9 ("serial: omap: Disallow RS-485 if rts-gpio is not specified") Cc: stable@vger.kernel.org Signed-off-by: Lino Sanfilippo l.sanfilippo@kunbus.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Link: https://lore.kernel.org/r/20240103061818.564-7-l.sanfilippo@kunbus.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/omap-serial.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 730755621879..f5a0b401af63 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1483,6 +1483,13 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) return omap_up_info; }
+static const struct serial_rs485 serial_omap_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND | + SER_RS485_RX_DURING_TX, + .delay_rts_before_send = 1, + .delay_rts_after_send = 1, +}; + static int serial_omap_probe_rs485(struct uart_omap_port *up, struct device *dev) { @@ -1497,6 +1504,9 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up, if (!np) return 0;
+ up->port.rs485_config = serial_omap_config_rs485; + up->port.rs485_supported = serial_omap_rs485_supported; + ret = uart_get_rs485_mode(&up->port); if (ret) return ret; @@ -1531,13 +1541,6 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up, return 0; }
-static const struct serial_rs485 serial_omap_rs485_supported = { - .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND | - SER_RS485_RX_DURING_TX, - .delay_rts_before_send = 1, - .delay_rts_after_send = 1, -}; - static int serial_omap_probe(struct platform_device *pdev) { struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev); @@ -1604,17 +1607,11 @@ static int serial_omap_probe(struct platform_device *pdev) dev_info(up->port.dev, "no wakeirq for uart%d\n", up->port.line);
- ret = serial_omap_probe_rs485(up, &pdev->dev); - if (ret < 0) - goto err_rs485; - sprintf(up->name, "OMAP UART%d", up->port.line); up->port.mapbase = mem->start; up->port.membase = base; up->port.flags = omap_up_info->flags; up->port.uartclk = omap_up_info->uartclk; - up->port.rs485_config = serial_omap_config_rs485; - up->port.rs485_supported = serial_omap_rs485_supported; if (!up->port.uartclk) { up->port.uartclk = DEFAULT_CLK_SPEED; dev_warn(&pdev->dev, @@ -1622,6 +1619,10 @@ static int serial_omap_probe(struct platform_device *pdev) DEFAULT_CLK_SPEED); }
+ ret = serial_omap_probe_rs485(up, &pdev->dev); + if (ret < 0) + goto err_rs485; + up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; cpu_latency_qos_add_request(&up->pm_qos_request, up->latency);